Question

Q.3 A) Give scientific reasons. (Any Three)
1) Blood donation is considered to be superior donation of all
donations.
2) Bubbles are seen on adding lemon juice to baking soda.
3) It is essential to change the tension on the vocal chords, as
we produce different sound note from our larynx.
4) Large dams destroy ecosystem.​

Answer 1

Answer:

1)Blood donation is considered superior of all donations because it can save someone's life. Most of the lives are lost due to blood loss during surgeries, accidents, or cases where regular blood transfusion is required. These lives can be saved if an adequate amount of blood is available.

2)Bubbles are seen on adding lemon juice to baking soda because lemon juice is citric acid and baking soda is sodium bicarbonate. On adding lemon juice in baking soda, we add acid in base then neutralization reaction is taking place resulting in the formation of salt ,water and brisk effervesence of carbon-dioxide.

3)It is essential to change the tension on the vocal cords , as we produce different sounds notes from our larynx . Answer: Just like the frequency of vibration of stretched string is changed by increasing or decreasing the tension, we need to change the tension in vocal chord to change the tone of sound

4)Large dams cause environmental damages to rivers, hydrologic basins and surrounding ecosystems, including: the worsening of water quality in rivers; the degradation of aquatic ecosystems and the disappearance of many riparian ecosystems; and serious harms to biopersity, including the extinction of species.

Explanation:

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Answer 2

Answer:

Blood donation is considered superior of all donations because it can save someone's life. Most of the lives are lost due to blood loss during surgeries, accidents, or cases where regular blood transfusion is required. These lives can be saved if an adequate amount of blood is available.

Explanation:

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